Instantaneous printing-plate holder.



No. 628,250. Patented July 4, |899. S. & M. MAYBELL. INSTANTANEOUS PRINTING PLATE HOLDER.

(Application lad In. 6, 1899.) (No Model.)

M5764... uw

warm Mq-4r* ATTORNEY 1N: Norms Pzvzns co. PHoYaLrmo.. WASHINGTON. n. c4

UNITED STATES PATENT OEEICE.

STEPHEN MAYBELL AND MARIT MAYBELI., OF SAN FRANCISCO, CALIFORNIA.

INSTANTANEOUS PRINTING-PLATE HOLDER. Y

SPECIFICATION forming part of Letters Patent No. 628,250, dated July 4, 1899.

Application filed March 6,1899. Serial No. 708,044. (No model.)

ing-plate holder, the object of our invention being to provide a device whereby an electrotype, stereotype, orprinting-pjlate may be instantly attached to or removed from a block for the purpose of printing.

Our invention therefore resides in the novel combination, construction, and arrangement of parts for the above end, hereinafter fully specified and particularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a plan View of the device. Fig. 2 is an end view thereof. Fig. 3 is a cross-section on an enlarged scale, the central portion being broken away; and Fig. it is a View of the under side of one of the clamps.

1 represents a suitable block of wood, to one end of which is xedly secured a vertical stop-plate 2, Whose edge projects aA sufficient height above the surface of the block to form a stop or rest for the end of the printing-plate 3. To the side of the block 1 is secured a vertical clamp-plate 4, the edge of which rises above the surface of the block like that of the plate 2, said edge having a longitudinal V- shaped groove 5, adapted to receive the bev"v eled edge 6 of the printing-plate and hold said plate when pressed against it laterally firmly down to the block. The upper'edge of saidv groove is notched, as shown at 7, to form a rou ghened clamping edge to bear against the edge of the printing-plate, furnishing additional prevention against slipping of said plate.

The block l on the side opposite to the plate 4 is recessed, as shown at 9, to receive the clamps 10. Each clamp is formed of a piece of sheet metal having its inner edge bent upward, as shown at 11, and then obliquely out- Ward from the body of the clamp, as shown at 12, said edge 12 being thus adapted to rest upon and grip the beveled edge of the printing-plate. Supporting each clamp 10 is a spring 13, formed into two coils 14, encircling a pivot-rod 15, the latter being passed longitudinally `through the block and intersecting the recesses 9. The middle portion of each spring 13 between its two coils is formed into an arm 16, which rests on the surface 17 of the block at the bottom of the corresponding recess, and the ends 18 of the spring are held by the edges of the sheetmetal clamp bent over said ends, as shown at 19, said ends being Iinally bent back on themselves, as shown at 20.

It will now be seen that a downward pressure on the clamps 10 compresses the springs 13 and removes the clamping edges 12 from the edge of the printing-plate, permitting the latter to be raised from the block. The arrangement of the spring 13, encircling the rod 15 and its arm 16 resting on the surface 17, causes a strong pressure to be exerted by the clamping edges 12 upon the edge of the printing-plate. This pressure is exerted both downwardly and forwardly, thus forcing the plate against the opposite clamping-,plate t and holding the printing-plate firmly in position.

We claim 1. The combination of a block, a clampplate secured on one side thereof having a longitudinal beveled edge above the surface of the block, a pivot-rod longitudinally arranged on the opposite side of the block, said block having a recess intersected by said rod, a spring coiled around said rod, and having a stationarily-supported arm, and a clamp supported by and movable with a free end of said spring, said clamp having on its inner side toward said block an oblique edge adapted to exert pressure upon the beveled edge of a printing-plate on said block, substantially as described.

2. The combination of a block, a clampplate secured on one side thereof having a longitudinal beveled edge above the surface of the block, a pivot-rod longitudinally arranged in the opposite sideof the block, said block having a recess intersected by said rod, a spring having its middle portion formed into a stationarily-supported arm, said spring, on each side of said middle portion, being coiled around said rod, and its free ends eX- tended outwardly from said rod and block,an`d

IOO

recess, the middle portion oi' said spring forminga stationarily supported arm,aud a clamp in each recess secured upon the free end ofthe spring therein, said clamps being formed of sheet-metal plates bent upward and then obliquely to bear upon the edge of a printingplate on said block, substan tially as described.

STEPHEN MAYBELL. MARY MAYBELL. Witnesses:

W. M. LACEY, HENRY M. MCGILL. 

